Full Duplex Wireless Transmission with Self-Interference Cancellation

Abstract

Two-way (full-duplex) wireless communications. Various embodiments measure interference channels and provide for interference cancellation in both analog and digital domains to mitigate self-interference. The system supports multiple clients wherein new clients can join the network asynchronously, and also supports Multiple-Input Multiple-Output (MIMO) antennas.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a non-provisional filing of, and claims benefit under 35 U.S.C. §119(e) from, U.S. Provisional Patent Application Ser. No. 61 / 646,312, filed May 13, 2012, and U.S. Provisional Patent Application Ser. No. 61 / 771,815, filed Mar. 2, 2013, both of which are hereby incorporated herein by reference. In addition, this application is related to the following applications, all of which are also incorporated herein by reference: Attorney docket 71501.US.01 entitled Wireless Transmission with Channel State Perturbation, filed May 13, 2013, Attorney Docket 71502.US.01, entitled Full Duplex Wireless Transmission with Channel Phase-Based Encryption, filed May 13, 2013, and Attorney docket 71503.US.01, entitled Distributed Collaborative Signaling in Full Duplex Wireless Transceivers, filed May 13, 2013.FIELD[0002]The present disclosure relates to wireless communications. In particular, the present disclosure relates to systems...

AI Technical Summary

Benefits of technology

The present patent is about a system and method to establish two-way (full-duplex) wireless links with support for the use of multiple transmit, multiple receive antennas. The technical effect of this patent is the ability to simultaneously communicate in both directions at the same time, which is not possible with separate time slots or separate frequency bands. The full-duplex capability provides new ways to facilitate networking and enhance security in multi-user wireless systems. The patent describes various methods and systems for realizing full-duplex communications, including interference cancellation and self-cancellation techniques.

Problems solved by technology

These alternatives have their relative pros and cons, but both suffer from lack of ability to transmit and to receive simultaneously and over the entire frequency band.

It is well known that two-way wireless is theoretically possible, but it is widely believed to be difficult to implement due to a potentially large amount of interference, called self-interference, between transmit and receive chains of the same node.

The impact of full-duplex links in these earlier applications is limited to doubling the rate by providing two symmetrical pipes of data flowing in opposite directions.

In fact, the general two-way channel is very difficult to realize in wireless communications due to excessive amounts of self-interference, i.e., the interference each transmitter generates for the receiver(s) in the same node.

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